Individual elements of the thermostat module on a carburetor engine
1 - thermostat housing; 2 - thermostat; 3 - water inlet nipple; 4 - plug and thermal switch; 5 - bolt, 6.5–8.5 N·m; 6 - water pump
It is important to remember that the thermostat has an air hole or a small pin that should be on the top side.
The thermostat can be tested by hanging it on a wire in a container of cold water, as shown in the illustration below.
Checking the thermostat. Hang the thermostat and thermometer in the container as indicated and heat the water.
Make sure that the thermostat does not touch the bottom or walls of the vessel.
1. Place a thermometer in the water. Heat the water gradually and note at what temperature the thermostat begins to open. This should happen at 76.5°C. At 90°C the thermostat should be fully open.
2. When installing the thermostat, hold it in your hand and determine where the vent or pin is. The vent or pin should be on top. Thermostats may also be marked with an arrow or the word "TOP". The arrow should point up.
3. Clean all sealing surfaces from the remains of the old seal and apply a bead of sealant 2 - 3 mm thick. This applies to the cover and, if removed, to the body.
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4. Screw the housing or housing cover back on.
5. Correct the coolant level and check the system for leaks.